carbon
Synthetic carbon polymers are produced in labs or factories. Plastics are common examples of synthetic carbon polymers. You are probably familiar with the plastic called polyethylene. All of the plastic items pictured in the Figure below are made of polyethylene. It consists of repeating monomers of ethylene C 2 H 4 . Structural formulas for ethylene and polyethylene are also shown in the Figure below . To learn more about synthetic carbon polymers and how they form, go to this URL: http://www. youtube. com/watch?v=7nCfbZwGWK8.